Max: "My car is broken! The battery is dead, the headlights are broken and the bumper is dented. Can you fix it?"
Me: "Yes sir, I can, but it will cost you a lot of money"
Max: "That's ok, I have lots of money"
Me: "Ok then" (play fixing the imaginary car) "All fixed! That will be $1000"
Max: "Ok, here, I have five 10 dollar bills"
Me: "Well, that's not exactly $1000"
Max: "Oh, ok, then I have $1000!"